Avery knows exactly what it takes to have a better future: survive high school, get a good university scholarship, and then head out into the world. However, her life changes overnight when it turns out that the billionaire Tobias Hawthorne left her his entire fortune. The strangest thing about it is that the girl didn't even know the old man and has no idea how he earned the billions that fell into his lap. But you can get the inheritance only on one condition: if you move into the Hawthorne house, which matches the castle and is full of secret corridors and codes. That wouldn't be too bad, but the relatives left behind live there, including Tobias' grandsons: four dangerously attractive, brilliant guys who grew up believing that one day they'll make billions. The main heir to the inheritance, Grayson, thinks Avery is a money-hungry con artist and will do anything to chase him away. Her younger brother, Jameson, sees her as their grandfather's last puzzle - a puzzle they must solve to understand why Tobias Hawthorne left his fortune to a wild stranger. Avery has two choices: run away and give up her inheritance, or enter the game with her life at stake.